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| physical phenomena > event > celestial event > periodic celestial event > orbital event > periapsis | 
| periapsis comparison table | |||
| Subject | is an instance of | is a kind of | has definition | 
|---|---|---|---|
| orbital event | periodic celestial event | Periodic celestial event in the orbit of a celestial body | |
| periapsis | orbital event | The point in the orbit of a satellite where it is closest to its primary. | 
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